基于socket的FTP客户端程序--请教不能连接上的问题

[tracyjk]

int main(int argc,char *argv[])
{
  int cmd_len,arg_len;
  int sock, sockmsg;
  int nFd;
  struct sockaddr_in server;
  struct hostent *hp;
  
  memset(&server, 0, sizeof(struct sockaddr_in));  /* 初始化socket */ 
  sock=socket(AF_INET,SOCK_STREAM,0);
  //sockmsg=socket(AF_INET,SOCK_STREAM,0);
     
  if (sock<0)
  {
    perror("opening stream socket");
    exit(1);
  }

  hp = gethostbyname(argv[1]);
  printf("hp is %d\n",hp);
  if (hp==0)
  {
  	printf("%s:unknown host\n",argv[1]);
    fprintf(stderr,"%s:unknown host\n",argv[1]);
    exit(2);
  }

	if ((nFd=socket(AF_INET, SOCK_STREAM, 0))==-1)
	{
		printf("连接网络失败\n");
		exit(1);
	}
	
 printf("nFd is [%d]---argv[2] [%s]\n",nFd,argv[2]);
  server.sin_family=AF_INET;
  server.sin_port=htons(atoi(argv[2]));

  server.sin_addr = *((struct in_addr *)hp->h_addr);
  
  //memcpy((char*)&server.sin_addr, (char*)hp->h_addr, hp->h_length);
 
  printf("connecting\n");
  int a;
  a=connect(sock,(struct sockaddr *)&server,sizeof(struct sockaddr));

 printf("a is [%d]\n",a);
  //if (connect(sock,(struct sockaddr *)&server,sizeof server)<0||connect(sockmsg,(struct sockaddr *)&servermsg,sizeof servermsg)<0)
  if (a<0)
  {
     perror("connecting stream socket");
    exit(1);
  }
  printf("connect\n");
  read(sock, buf, dataLen); 

  printf("buf is [%s]\n",buf);
  return 0;
}

在手持设备上用上面的程序连接到59.57.14.21这个ip上
用的是手机卡

程序打印玩connecting后，就卡在connect处


用电脑登陆上面的那个ip可以登录到该网址的ftp上

不懂是程序的问题还是用手机卡连接慢的问题

请各位大牛指点下

[twglinda]

好啊.太好了,以后会常来看看的.可!